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APA Citation
Gao, W., Watts, C., Ren, T., Shin, H., Taherzadeh, S., Attenborough, K., Jenkins, M., & Whalley, W. (2013). estimating Penetrometer Resistance and Matric Potential from the Velocities of Shear and Compression Waves. Soil Science Society of America Journal, 77(3), 721–728. http://access.bl.uk/ark:/81055/vdc_100099478276.0x00002b